The novels that were downloaded to the SD card couldn't be read on the phone because the phone didn't support reading the SD card or the SD card was removed or damaged. If the novel file contains the browser format, you can try to install a browser on another phone, such as Chromefox or FireFox, and open the browser to view the file. If the phone doesn't support the browser format, you might have to use other media players to view novels such as MP3s or audio files.